fix(codeagent-wrapper): add worker limit cap and remove legacy alias

- Add maxParallelWorkersLimit=100 cap for CODEAGENT_MAX_PARALLEL_WORKERS
- Remove scripts/install.sh (codex-wrapper legacy alias no longer needed)
- Fix README command example: /gh-implement -> /gh-issue-implement
- Add TestResolveMaxParallelWorkers unit test for limit validation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README_CN.md

@@ -233,8 +233,6 @@ python3 install.py --module dev
 
 # 手动
 bash install.sh
-# 创建 codex-wrapper 兼容别名（使用 $INSTALL_DIR 或 ~/bin）
-bash scripts/install.sh
 ```
 
 #### Windows 系统